There's currently no established Tolerable Upper Intake Level (UL) for B12 due to insufficient scientific evidence
But if left untreated, it may cause the following symptoms: Weakness, tiredness, or lightheadedness Lack of energy A decline in your mental abilities, such as memory and focus A painful and red tongue (glossitis) Mouth ulcers Pins and needles (paraesthesia) Disturbed vision Irritability Causes of Vitamin B12 deficiency
Dietary deficiency: Vegans (strict vegetarians who do not eat any meat, fish, egg, or dairy products) can develop vitamin B 12 deficiency because they lack vitamin B 12 in their diets
2.5 mg from the 50 mg vial) are what you draw and inject SC after reconstitution 45 units and 20 units respectively on a U-100 syringe (see the math above)
this is often around 90 days from compounding when refrigerated, or shorter if stored at room temperature as stability permits